SEARCHING for FOSSIL EVIDENCE of AGN FEEDBACK in WISE-SELECTED STRIPE-82 GALAXIES by MEASURING the THERMAL SUNYAEV-ZEL'DOVICH EFFECT with the ATACAMA COSMOLOGY TELESCOPE

Alexander Spacek, Evan Scannapieco, Seth Cohen, Bhavin Joshi, Philip Mauskopf

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We directly measure the thermal energy of the gas surrounding galaxies through the thermal Sunyaev-Zel'dovich (tSZ) effect. We perform a stacking analysis of microwave background images from the Atacama Cosmology Telescope, around 1179 massive quiescent elliptical galaxies at 0.5 ≤ z ≤ 1.0 ("low-z") and 3274 galaxies at 1.0 ≤ z ≤ 1.5 ("high-z"), selected using data from the Wide-field Infrared Survey Explorer All-Sky Survey and the Sloan Digital Sky Survey (SDSS) within the SDSS Stripe-82 field. The gas surrounding these galaxies is expected to contain energy from past episodes of active galactic nucleus (AGN) feedback, and after using modeling to subtract undetected contaminants, we detect a tSZ signal at a significance of for our low-z galaxies and for our high-z galaxies. We then include data from the high-frequency Planck bands for a subset of 227 low-z galaxies and 529 high-z galaxies and find low-z and high-z tSZ detections of and , respectively. These results indicate an average thermal heating around these galaxies of erg for our low-z galaxies and erg for our high-z galaxies. Based on simple heating models, these results are consistent with gravitational heating without additional heating due to AGN feedback.

Original languageEnglish (US)
Article number102
JournalAstrophysical Journal
Volume834
Issue number2
DOIs
Publication statusPublished - Jan 10 2017

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Keywords

  • cosmic background radiation
  • galaxies: evolution
  • intergalactic medium
  • large-scale structure of universe
  • quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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